Coffee percolator



Oct. 18, 1949. A. G. WAI-n.

COFFEE PERCOLATOR Filed June 2,' 1947 INV EN TOR.

Patented Oct. 18', 1949 UNITED STATES PTENT OFFICE COFFEE PERCOLATOR Albert G. Wahl, Los Angeles, Calif. Application June 2, 1947, Serial No. I751,930 1 Claim. (Cl. 10S-231.5)

My invention relates to a coffee percolator and has for its principal objects, to generally improve upon and simplify the construction of the existing forms of similar utensils; to provide simple and efficient means for very rapidly establishing the percolation function after the utensil has been placed over an open flame or other source of heat, and further, to provide means for materially cutting down the escape of heat from the stream of liquid flowing from the heating coil to the bowl containing the ground or pulverized coffee, and which provision is effective in materially speeding up the production of potable coffee.

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts which will be hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which:

Fig. l is a vertical section taken through the center .of a percolator constructed in accordance with my invention.

Fig. 2 is a view looking against the bottom of the percolator.

Referring by numerals to the accompanying drawing which illustrates a preferred embodiment of my invention, I designates the wall of a can-like container, II the bottom is slightly elevated with respect to the lower edge of said wall and I2, a coiled tube preferably of copper which is suitably secured in position beneath bottom II. x

The open outer end of coil I2 extends upwardly into the chamber in container above bottom II and extending vertically upward from the inner end of said coil, to a point near the top of the container is a tube I2a.

The lower portion of tube I2a is clamped to bottom II by nuts I5 and I6, screw seated on a threaded portion I4 of said tube and on top of the upper nut I6 is a packing disc.

Resting on packing ring I'I is the lower end ofa cylindrical shell I8 larger in diameter than tube I2a, thus providing, around a substantial portion of the latter, a chamber I2b, from which the air is exhausted, thus providing insulation to minimize transference of heat from the liquid passing upward through tube I2a, to the liquid in the container surrounding the shell I8.

Mounted on the upper end of shell I8, is a packing ring I9 held in place by a nut 20, seated on a threaded portion of tube I2a. Those portions of tube I2a which are threaded are slightly 2 enlarged as a result of internally applied pressure.

A shallow receptacle for the pulverized coffee, comprising a circular wall 2I and a bottom having small perforations 22, is provided with a centrally arranged tube 23, which receives the upper portion of tube I2a, and said receptacle rests on nut 20.

To use my improved percolator, water is placed in container Il), and pulverized coee is placed in container 2I and when the utensil is positioned above the open flame of a gas burner or other source of heat, the water entering and passing through coil I2 will rapidly become heated and after flowing upwardly through tube I2 will discharge from the upper end thereof into container 2l, and percolate through the body of pulverized coffee therein.

After passing through apertures 22 in the bottom of container 2|, the liquid unites with the liquid in the lower portion of container I0, thus completing its cycle flow, and as the latter is repeated, the circulation of the liquid and percolating function becomes continuous, and thereby rapidly produces liquid coffee of. the desired strength.

During flow of the highly heated liquid, from the inner end of coil I2, upwardly, the vacuum chamber between the lower portion of said tube and shell I8 counteracts transference of heat from the liquid flowing through the tube to the cooler liquid in container I0 surrounding said shell.

Thus my improved construction is particularly effective in materially decreasing the time ordinarily required for producing coffee by percolation methods.

Minor changes in the size, form and construction of the various parts of my improved coffee percolator may be made and substituted for those herein shown and described without departing from the spirit of the invention, the scope of which is set forth in the appended claim.

I claim as my invention:

In a coffee percolator, a container, a coiled tube disposed below and secured to the bottom of said container, the outer end of which tube communicates with the interior of said container, a tube extending upwardly into said container from the inner end of said coiled tube, heat insulating means comprising a shell surrounding and spaced apart from the lower portion of said upwardly extending tube, portions of the tube extending upwardly from the center of the coiled tube being threaded above and below said shell, a nut and packing ring on the threaded portion of said up- REFERENCES CITED wardly extending tube above said shell, a nut and packing ring on the threaded portion of said tube The fOllOWing references are 0f record in the below said shell which last mentioned nut bears le 0f this patent! on top of the bottom of said container and a nut 5 UNITED on the threaded portion of said tube below said STATES PATENTS shell and bearing on the under face of said con- Numbe' Name Date tuinen 868,187 IVBS Oct. 15, 1907 1,431,490 Rowley Oct.v 10, 1922 ALBERT G, WAHL. 10 1,452,256 Rowley Apr. 17, 1923 1.971.758 Olds Aug. 28, 1934 

